Vktech 5PCS Converter Presta to Schrader Bicycle Bike Valve Adaptor Tube Pump Tools(red) 100% Brand new and high quality Convert a Presta Valve to a Schrader Valve. Also turn a UK Valve into a US Valve Size:Approx.1.5cm x 0.9cm x0.7cm.(L*Big head diameter*Small head diameter) Material: Zinc Alloy ( Copper Plated )